package com.hx.myblog3.service;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.hx.myblog3.entity.Comment;
import com.hx.myblog3.repository.CommentRepo;

@Component
public class CommentService {
	@Autowired
    private CommentRepo cr;
	
	//保存评论
	public void save(Comment comment){
		cr.save(comment);
	}
	 /** 
	   * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
	   * 
	   * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 
	   * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
	   * 
	   * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
	   * 192.168.1.100 
	   * 
	   * 用户真实IP为： 192.168.1.110 
	   * 
	   * @param request 
	   * @return 
	   */
	  public static String  getIpAddress(HttpServletRequest request){
	    String ip = request.getHeader("x-forwarded-for"); 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("Proxy-Client-IP"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("WL-Proxy-Client-IP"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("HTTP_CLIENT_IP"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("HTTP_X_FORWARDED_FOR"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getRemoteAddr(); 
	    } 
	    return ip; 
	  } 
	    		  
}
